Use the Chromium libfuzzer template instead of rolling our own.

This lets us use their fancy features, including seed_corpus which is
super handy.

NOTRY=true

Review-Url: https://codereview.webrtc.org/2081683002
Cr-Original-Commit-Position: refs/heads/master@{#13216}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 839315becab30fb1d781b3c0adc21595ef9b75a2
2 files changed